Solution of the Navier-Stokes equations for three-dimensional turbulent flow with viscous sublayer resolution

A consistently-split linearized block implicit (LBI) scheme for the unsteady ensemble-averaged Navier-Stokes equations is used as an iterative means of obtaining steady solutions. Techniques for treating both 'physical' boundary conditions which define the flow problem and also intermediate boundary conditions required by the split solution algorithm are described. It is demonstrated that large /0(1)/ time steps can be used to accelerate convergence and that rapid convergence (about 80 noniterative time steps) can be obtained for three-dimensional turbulent subsonic flow, with viscous sublayer resolution. Solutions for both laminar and turbulent flow in a strongly curved three-dimensional rectangular duct and a two-dimensional channel of the same curvature are presented, together with mesh refinement and experimental comparisons.